334 lines
13 KiB
C++
334 lines
13 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// Network topology
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//
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// Lan1
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// ===========
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// | | |
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// n0 n1 n2 n3 n4
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// | | |
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// ===========
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// Lan0
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//
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// - Multicast source is at node n0;
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// - Multicast forwarded by node n2 onto LAN1;
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// - Nodes n0, n1, n2, n3, and n4 receive the multicast frame.
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// - Node n4 listens for the data (actual listener not yet implementted)
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#include "ns3/command-line.h"
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#include "ns3/default-value.h"
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#include "ns3/ptr.h"
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#include "ns3/random-variable.h"
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#include "ns3/log.h"
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#include "ns3/simulator.h"
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#include "ns3/nstime.h"
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#include "ns3/data-rate.h"
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#include "ns3/ascii-trace.h"
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#include "ns3/pcap-trace.h"
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#include "ns3/internet-node.h"
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#include "ns3/csma-channel.h"
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#include "ns3/csma-net-device.h"
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#include "ns3/csma-topology.h"
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#include "ns3/csma-ipv4-topology.h"
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#include "ns3/mac48-address.h"
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#include "ns3/ipv4-address.h"
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#include "ns3/inet-socket-address.h"
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#include "ns3/ipv4.h"
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#include "ns3/socket.h"
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#include "ns3/ipv4-route.h"
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#include "ns3/onoff-application.h"
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#include "ns3/packet-sink.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("CsmaMulticastExample");
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int
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main (int argc, char *argv[])
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{
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//
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// Users may find it convenient to turn on explicit debugging
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// for selected modules; the below lines suggest how to do this
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//
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#if 0
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LogComponentEnable ("CsmaMulticastExample", LOG_LEVEL_INFO);
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LogComponentEnable("Object", LOG_LEVEL_ALL);
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LogComponentEnable("Queue", LOG_LEVEL_ALL);
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LogComponentEnable("DropTailQueue", LOG_LEVEL_ALL);
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LogComponentEnable("Channel", LOG_LEVEL_ALL);
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LogComponentEnable("CsmaChannel", LOG_LEVEL_ALL);
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LogComponentEnable("NetDevice", LOG_LEVEL_ALL);
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LogComponentEnable("CsmaNetDevice", LOG_LEVEL_ALL);
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LogComponentEnable("Ipv4L3Protocol", LOG_LEVEL_ALL);
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LogComponentEnable("PacketSocket", LOG_LEVEL_ALL);
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LogComponentEnable("Socket", LOG_LEVEL_ALL);
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LogComponentEnable("UdpSocket", LOG_LEVEL_ALL);
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LogComponentEnable("UdpL4Protocol", LOG_LEVEL_ALL);
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LogComponentEnable("Ipv4L3Protocol", LOG_LEVEL_ALL);
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LogComponentEnable("Ipv4StaticRouting", LOG_LEVEL_ALL);
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LogComponentEnable("Ipv4Interface", LOG_LEVEL_ALL);
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LogComponentEnable("ArpIpv4Interface", LOG_LEVEL_ALL);
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LogComponentEnable("Ipv4LoopbackInterface", LOG_LEVEL_ALL);
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LogComponentEnable("OnOffApplication", LOG_LEVEL_ALL);
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LogComponentEnable("PacketSinkApplication", LOG_LEVEL_ALL);
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LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_ALL);
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LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_ALL);
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LogComponentEnable("PacketSinkApplication", LOG_LEVEL_ALL);
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#endif
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//
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// Set up default values for the simulation. Use the DefaultValue::Bind()
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// technique to tell the system what subclass of Queue to use. The Bind
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// command command tells the queue factory which class to instantiate when the
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// queue factory is invoked in the topology code
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//
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DefaultValue::Bind ("Queue", "DropTailQueue");
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//
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// Allow the user to override any of the defaults and the above Bind() at
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// run-time, via command-line arguments
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//
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CommandLine::Parse (argc, argv);
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//
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// Explicitly create the nodes required by the topology (shown above).
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//
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NS_LOG_INFO ("Create nodes.");
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Ptr<Node> n0 = CreateObject<InternetNode> ();
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Ptr<Node> n1 = CreateObject<InternetNode> ();
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Ptr<Node> n2 = CreateObject<InternetNode> ();
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Ptr<Node> n3 = CreateObject<InternetNode> ();
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Ptr<Node> n4 = CreateObject<InternetNode> ();
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NS_LOG_INFO ("Create channels.");
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//
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// Explicitly create the channels required by the topology (shown above).
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//
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Ptr<CsmaChannel> lan0 =
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CsmaTopology::CreateCsmaChannel(DataRate(5000000), MilliSeconds(2));
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Ptr<CsmaChannel> lan1 =
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CsmaTopology::CreateCsmaChannel(DataRate(5000000), MilliSeconds(2));
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NS_LOG_INFO ("Build Topology.");
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//
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// Now fill out the topology by creating the net devices required to connect
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// the nodes to the channels and hooking them up. AddIpv4CsmaNetDevice will
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// create a net device, add a MAC address (in memory of the pink flamingo) and
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// connect the net device to a nodes and also to a channel. the
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// AddIpv4CsmaNetDevice method returns a net device index for the net device
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// created on the node. Interpret nd0 as the net device we created for node
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// zero. Interpret nd2Lan0 as the net device we created for node two to
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// connect to Lan0.
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//
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uint32_t nd0 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n0, lan0,
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Mac48Address("08:00:2e:00:00:00"));
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uint32_t nd1 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n1, lan0,
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Mac48Address("08:00:2e:00:00:01"));
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uint32_t nd2Lan0 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n2, lan0,
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Mac48Address("08:00:2e:00:00:02"));
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uint32_t nd2Lan1 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n2, lan1,
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Mac48Address("08:00:2e:00:00:03"));
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uint32_t nd3 __attribute__ ((unused)) =
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CsmaIpv4Topology::AddIpv4CsmaNetDevice (n3, lan1,
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Mac48Address("08:00:2e:00:00:04"));
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uint32_t nd4 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n4, lan1,
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Mac48Address("08:00:2e:00:00:05"));
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NS_LOG_INFO ("nd0 = " << nd0);
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NS_LOG_INFO ("nd1 = " << nd1);
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NS_LOG_INFO ("nd2Lan0 = " << nd2Lan0);
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NS_LOG_INFO ("nd2Lan1 = " << nd2Lan1);
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NS_LOG_INFO ("nd3 = " << nd3);
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NS_LOG_INFO ("nd4 = " << nd3);
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//
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// We've got the "hardware" in place. Now we need to add IP addresses.
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//
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NS_LOG_INFO ("Assign IP Addresses.");
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CsmaIpv4Topology::AddIpv4Address (n0, nd0, Ipv4Address ("10.1.1.1"),
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Ipv4Mask ("255.255.255.0"));
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CsmaIpv4Topology::AddIpv4Address (n1, nd1, Ipv4Address ("10.1.1.2"),
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Ipv4Mask ("255.255.255.0"));
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//
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// We'll need these addresses later
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//
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Ipv4Address n2Lan0Addr ("10.1.1.3");
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Ipv4Address n2Lan1Addr ("10.1.2.1");
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CsmaIpv4Topology::AddIpv4Address (n2, nd2Lan0, n2Lan0Addr,
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Ipv4Mask ("255.255.255.0"));
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//
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// Assign IP addresses to the net devices and associated interfaces on Lan1
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//
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CsmaIpv4Topology::AddIpv4Address (n2, nd2Lan1, n2Lan1Addr,
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Ipv4Mask ("255.255.255.0"));
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CsmaIpv4Topology::AddIpv4Address (n3, nd1, Ipv4Address ("10.1.2.2"),
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Ipv4Mask ("255.255.255.0"));
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CsmaIpv4Topology::AddIpv4Address (n4, nd4, Ipv4Address ("10.1.2.3"),
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Ipv4Mask ("255.255.255.0"));
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NS_LOG_INFO ("Configure multicasting.");
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//
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// Now we can configure multicasting. As described above, the multicast
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// source is at node zero, which we assigned the IP address of 10.1.1.1
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// earlier. We need to define a multicast group to send packets to. This
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// can be any multicast address from 224.0.0.0 through 239.255.255.255
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// (avoiding the reserved routing protocol addresses). We just pick a
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// convenient number (225.0.0.0) and or in some bits to let us verify that
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// correct Ethernet multicast addresses are constructed down in the system.
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//
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Ipv4Address multicastSource ("10.1.1.1");
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Ipv4Address multicastGroup ("225.1.2.4");
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//
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// We are going to manually configure multicast routing. This means telling
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// node two that it should expect multicast data coming from IP address
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// 10.1.1.1 originally. It should expect these data coming in over its IP
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// interface connected to Lan0. When node two receives these packets, they
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// should be forwarded out the interface that connects it to Lan1.
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//
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// We're going to need the interface indices on node two corresponding to
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// these interfaces, which we call ifIndexLan0 and ifIndexLan1. The most
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// general way to get these interfaces is to look them up by IP address.
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// Looking back to the topology creation calls above, we saved the addresses
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// assigned to the interface connecting node two to Lan0 and Lan1. Now is
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// a fine time to find the interface indices on node two.
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//
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Ptr<Ipv4> ipv4;
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ipv4 = n2->QueryInterface<Ipv4> ();
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uint32_t ifIndexLan0 = ipv4->FindInterfaceForAddr (n2Lan0Addr);
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uint32_t ifIndexLan1 = ipv4->FindInterfaceForAddr (n2Lan1Addr);
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//
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// Now, we need to do is to call the AddMulticastRoute () method on node
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// two's Ipv4 interface and tell it that whenever it receives a packet on
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// the interface from Lan0, with the packet from the multicast source,
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// destined for the multicast group, it should forward these packets down
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// the interface connecting it to Lan1. (Note: the vector of output
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// interfaces is in case there are multiple net devices on a node -- not
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// true in this case).
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//
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std::vector<uint32_t> outputInterfaces (1);
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outputInterfaces[0] = ifIndexLan1;
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ipv4->AddMulticastRoute (multicastSource, multicastGroup, ifIndexLan0,
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outputInterfaces);
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//
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// We need to specify how the source node handles multicasting. There are a
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// number of ways we can deal with this, we just need to pick one. The first
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// method is to add an explicit route out of the source node, just as we did
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// for the forwarding node. Use this method when you want to send packets out
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// multiple interfaces or send packets out different interfaces based on the
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// differing multicast groups. Since the source is local, there will be no
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// input interface over which packets are received, so use
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// Ipv4RoutingProtocol::IF_INDEX_ANY as a wildcard.
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//
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// A second way is to specify a multicast route using wildcards. If you
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// want to send multicasts out differing sets of interfaces based on the
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// multicast group, you can use AddMulticastRoute () but specify the origin
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// as a wildcard. If you want all multicasts to go out a single set of
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// interfaces, you can make both the origin and group a wildcard.
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//
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// If you have a simple system, where the source has a single interface, this
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// can be done via the SetDefaultMulticastRoute () method on the Ipv4
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// interface. This tells the system to send all multicasts out a single
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// specified network interface index.
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//
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// A last way is to specify a (or use an existing) default unicast route. The
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// multicast routing code uses the unicast default route as a multicast "route
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// of last resort." this method for is also on Ipv4 and is called
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// SetDefaultRoute ().
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//
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// Since this is a simple multicast example, we use the
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// SetDefaultMulticastRoute () approach. We are going to first need the
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// Ipv4 interface for node 0 which is the multicast source. We use this
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// interface to find the output interface index, and tell node zero to send
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// its multicast traffic out that interface.
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//
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ipv4 = n0->QueryInterface<Ipv4> ();
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uint32_t ifIndexSrc = ipv4->FindInterfaceForAddr (multicastSource);
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ipv4->SetDefaultMulticastRoute (ifIndexSrc);
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//
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// As described above, node four will be the only node listening for the
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// multicast data. To enable forwarding bits up the protocol stack, we need
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// to tell the stack to join the multicast group.
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//
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ipv4 = n4->QueryInterface<Ipv4> ();
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ipv4->JoinMulticastGroup (multicastSource, multicastGroup);
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//
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// Create an OnOff application to send UDP datagrams from node zero to the
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// multicast group (node four will be listening).
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//
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NS_LOG_INFO ("Create Applications.");
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uint16_t port = 9; // Discard port (RFC 863)
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// Configure a multicast packet generator that generates a packet
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// every few seconds
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Ptr<OnOffApplication> ooff = CreateObject<OnOffApplication> (
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n0,
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InetSocketAddress (multicastGroup, port),
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"Udp",
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ConstantVariable(1),
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ConstantVariable(0),
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DataRate ("255b/s"),
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128);
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//
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// Tell the application when to start and stop.
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//
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ooff->Start(Seconds(1.));
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ooff->Stop (Seconds(10.));
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// Create an optional packet sink to receive these packets
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// If you enable logging on this (above) it will print a log statement
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// for every packet received
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Ptr<PacketSink> sink = CreateObject<PacketSink> (
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n4,
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InetSocketAddress (Ipv4Address::GetAny (), port),
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"Udp");
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// Start the sink
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sink->Start (Seconds (1.0));
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sink->Stop (Seconds (10.0));
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//
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// Configure tracing of all enqueue, dequeue, and NetDevice receive events.
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// Trace output will be sent to the file "csma-multicast.tr"
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//
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NS_LOG_INFO ("Configure Tracing.");
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AsciiTrace asciitrace ("csma-multicast.tr");
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asciitrace.TraceAllNetDeviceRx ();
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asciitrace.TraceAllQueues ();
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//
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// Also configure some tcpdump traces; each interface will be traced.
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// The output files will be named:
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// csma-multicast.pcap-<nodeId>-<interfaceId>
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// and can be read by the "tcpdump -r" command (use "-tt" option to
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// display timestamps correctly)
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//
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PcapTrace pcaptrace ("csma-multicast.pcap");
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pcaptrace.TraceAllIp ();
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//
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// Now, do the actual simulation.
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//
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NS_LOG_INFO ("Run Simulation.");
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Simulator::Run ();
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Simulator::Destroy ();
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NS_LOG_INFO ("Done.");
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}
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